Nikita Popov 57d4a02659 Handle isolated \r in doc string
Doc strings have a trailing \n and these will get interpreted as
\r\n and removed from the string contents.

For nowdoc, fall back to single quote if there's a trailing \r.
For heredoc, escape all isolated \r -- unlike \n and \r\n this is
really a special character, because this is no longer relevant as
an actual newline character.
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